- Movement of tectonic plates: When Earth’s plates collide, slide past, or move away from each other, stress builds up and is released suddenly as an earthquake.
- Volcanic activity: Eruptions can cause earthquakes when magma forces its way through cracks in the crust, creating tremors around the volcano.
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प्रश्न
State two natural causes of an earthquake.
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उत्तर
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Earthquake and its causes
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पाठ 8: Earthquakes - EXERCISES [पृष्ठ ७९]
APPEARS IN
संबंधित प्रश्न
Identify and name the internal movement.
Molten magma is thrown out of the earth’s mantle.
Arrange the following statements in chronological order in which an earthquake occurs.
- The earth’s surface vibrates.
- The plates suddenly move.
- Due to the movements in the mantle, compression goes on increasing.
- Along the weak points ( faultlines) rocks break apart.
- Stored energy is released in the form of seismic waves.
Fill in the blank:
About 70 percent of the earthquakes occur in the _________________ Belt.
How are earthquakes useful?
Match the Columns.
| Column A | Column B |
| 1. Tsunami | (a) The waves that make the inhabitants feel the ground motion. |
| 2. Seismograph | (b) The instrument for measuring the intensity of earthquakes. |
| 3. S-waves | (c) Harbour waves generated by oceanic earthquakes. |
| 4. Richter scale | (d) The point on the earth surface directly above the seismic focus. |
| 5. Epicentre | (e) An instrument for recording the movement of earthquake waves. |
Is it possible to predict an earthquake? Give reasons to support your answer.
How is the intensity of an earthquake measured?
How an earthquake is caused?
Name the important Earthquake-belts of the world.
OR
Indicate two major belts of Earthquakes.
Name the instrument used to record Earthquakes.
Earthquakes occur in the Mid-Atlantic belt.
Why are earthquakes related to volcanoes?
Answer the following:
A volcanic eruption is one of the main causes of earthquakes.
The earthquake waves are recorded by an instrument known as ______.
Seismology is the study of ______.
Choose the odd one
Choose the odd one
On an outline map of the world, mark the Pacific Ring of Fire
